`SA1402` Should not apply to file-scoped types

[RenderMichael]

The following code should not give a warning

public sealed class C
{
}

file static class CHelpers
{
}

[bjornhellander]

Seems like a reasonable request to me, since this situation is why the file modifier was added

[6bee]

Please merge PR #3879 to resolve this issue.

[6bee]

There has been a ready-to-merge PR to resolve this issue, waiting for six month, that has not even been looked at. If maintenance for this project/repo has been abandoned, please mention it in the readme so people no longer need to bother.

[julealgon]

@sharwell can you provide a position on this? Is there a reason these small changes are kept waiting for months without being merged?